Common Source of Automotive Vibration?
Common Source of Automotive Vibration?
(OP)
For any vehicle, where would you find the highest vibration?
I'm testing out an accelerometer that will be used to wake up electronics.
I'm testing out an accelerometer that will be used to wake up electronics.





RE: Common Source of Automotive Vibration?
Fe
RE: Common Source of Automotive Vibration?
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
Chinese prisoner wins Nobel Peace Prize
RE: Common Source of Automotive Vibration?
www.priamengineering.co.uk
RE: Common Source of Automotive Vibration?
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
Chinese prisoner wins Nobel Peace Prize
RE: Common Source of Automotive Vibration?
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Common Source of Automotive Vibration?
RE: Common Source of Automotive Vibration?
For vibrations in the engine, should I expect things like timing belts to remain rpm independent as opposed to cylinders?
As for environment induced vibrations, what components would likely be affected? Or does the suspension system dampen everything out?
RE: Common Source of Automotive Vibration?
Huh? A well adjusted timing belt runs at the same rpm as the engine, since it's intimately connected to it.
"what components would likely be affected"
There really ought not be any, since vibration reduces life. There's a general vibration environment, and as mentioned a couple times already, the engine itself is a large part of that.
If you don't want to alter the car, then why not use a clip-on spark plug wire sensor? Not only will you get an indication of engine rpm, but also timing.
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
Chinese prisoner wins Nobel Peace Prize
RE: Common Source of Automotive Vibration?
RE: Common Source of Automotive Vibration?
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Common Source of Automotive Vibration?
RE: Common Source of Automotive Vibration?
Yes, around here we use the oxymoron "rush hour!"
RE: Common Source of Automotive Vibration?
Nonetheless, the "chemical sensor" might still be able to make a decent measurement, with the engine spark sensor doing a minimum of processing to validate a time series of ignition pulses as being consistent with normal driving. Presumably, measurement system will be making measurements over the course of days or weeks, so a singular instance of odd behavior shouldn't mess things up too much. If these erroneous events happen too often, then the car chosen for measurement was a bad choice.
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
Chinese prisoner wins Nobel Peace Prize
RE: Common Source of Automotive Vibration?
If the engine is not engaged to the transmission and drivetrain and it is "revved" would it not exhibit more vibration than the situation where the vehicle is driving and we rev the engine?
I never thought of this before, just a thought.
The inertia of he drivetrain components may change the amplitude and or dampen the engine case vibration.
Fe
RE: Common Source of Automotive Vibration?
Wheel sensors and spark plug sensor combined would sense engine running and wheels turning and that covers all but the most bizarre circumstances, like sliding along an ice covered road with engine running and brakes locked.
Regards
Pat
See FAQ731-376: Eng-Tips.com Forum Policies for tips on use of eng-tips by professional engineers &
http://eng-tips.com/market.cfm
for site rules
RE: Common Source of Automotive Vibration?
When the voltage goes from 12 or less to 13 or more, the engine has started, and chances are the car will move soon.
When the voltage goes back down to 12 or less, the engine has stopped, and chances are the car is not moving.
Mike Halloran
Pembroke Pines, FL, USA
RE: Common Source of Automotive Vibration?
A simple accelerometer like in fancy smart phones might detect motion to a sufficient degree.
Regards
Pat
See FAQ731-376: Eng-Tips.com Forum Policies for tips on use of eng-tips by professional engineers &
http://eng-tips.com/market.cfm
for site rules
RE: Common Source of Automotive Vibration?
Dan - Owner

http://www.Hi-TecDesigns.com
RE: Common Source of Automotive Vibration?
On my Explorer that would tell you that you'd found the hole...there's always voltage in there if nothing's broken.
RE: Common Source of Automotive Vibration?
The voltage varies when the alternator is charging as the engine runs.
I know modern Hondas s cut back the alternator voltage output once the battery is charged however I do not think that is common on other brands yet.
Regards
Pat
See FAQ731-376: Eng-Tips.com Forum Policies for tips on use of eng-tips by professional engineers &
http://eng-tips.com/market.cfm
for site rules
RE: Common Source of Automotive Vibration?